1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
6 #include <linux/rwsem.h>
7 #include <linux/notifier.h>
8 #include <linux/nsproxy.h>
9 #include <linux/ns_common.h>
10 #include <linux/refcount.h>
11 #include <linux/rhashtable.h>
13 struct user_namespace;
18 bool tables_initialized;
19 struct rw_semaphore rwsem;
22 struct rhashtable key_ht;
25 struct ipc_namespace {
27 struct ipc_ids ids[3];
32 unsigned int msg_ctlmax;
33 unsigned int msg_ctlmnb;
34 unsigned int msg_ctlmni;
40 unsigned long shm_tot;
43 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
48 struct notifier_block ipcns_nb;
50 /* The kern_mount of the mqueuefs sb. We take a ref on it */
51 struct vfsmount *mq_mnt;
53 /* # queues in this ns, protected by mq_lock */
54 unsigned int mq_queues_count;
56 /* next fields are set through sysctl */
57 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
58 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
59 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
60 unsigned int mq_msg_default;
61 unsigned int mq_msgsize_default;
63 /* user_ns which owns the ipc ns */
64 struct user_namespace *user_ns;
65 struct ucounts *ucounts;
70 extern struct ipc_namespace init_ipc_ns;
71 extern spinlock_t mq_lock;
74 extern void shm_destroy_orphaned(struct ipc_namespace *ns);
75 #else /* CONFIG_SYSVIPC */
76 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
77 #endif /* CONFIG_SYSVIPC */
79 #ifdef CONFIG_POSIX_MQUEUE
80 extern int mq_init_ns(struct ipc_namespace *ns);
82 * POSIX Message Queue default values:
84 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
85 * DFLT_*MAX: Default values for the maximum unprivileged limits
86 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
87 * an attribute to the open call and the queue must be created
88 * HARD_*: Highest value the maximums can be set to. These are enforced
89 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
93 * Per app minimum openable message queues - 8. This does not map well
94 * to the fact that we limit the number of queues on a per namespace
95 * basis instead of a per app basis. So, make the default high enough
96 * that no given app should have a hard time opening 8 queues.
97 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
98 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
99 * we have run into a situation where running applications in the wild
100 * require this to be at least 5MB, and preferably 10MB, so I set the
101 * value to 16MB in hopes that this user is the worst of the bunch and
102 * the new maximum will handle anyone else. I may have to revisit this
105 #define DFLT_QUEUESMAX 256
108 #define DFLT_MSGMAX 10
109 #define HARD_MSGMAX 65536
110 #define MIN_MSGSIZEMAX 128
111 #define DFLT_MSGSIZE 8192U
112 #define DFLT_MSGSIZEMAX 8192
113 #define HARD_MSGSIZEMAX (16*1024*1024)
115 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
118 #if defined(CONFIG_IPC_NS)
119 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
120 struct user_namespace *user_ns, struct ipc_namespace *ns);
122 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
125 refcount_inc(&ns->count);
129 extern void put_ipc_ns(struct ipc_namespace *ns);
131 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
132 struct user_namespace *user_ns, struct ipc_namespace *ns)
134 if (flags & CLONE_NEWIPC)
135 return ERR_PTR(-EINVAL);
140 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
145 static inline void put_ipc_ns(struct ipc_namespace *ns)
150 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
152 struct ctl_table_header;
153 extern struct ctl_table_header *mq_register_sysctl_table(void);
155 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
157 static inline struct ctl_table_header *mq_register_sysctl_table(void)
162 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */